221425530 has 16 divisors (see below), whose sum is σ = 531421344. Its totient is φ = 59046800.

The previous prime is 221425517. The next prime is 221425549. The reversal of 221425530 is 35524122.

It is a self number, because there is not a number n which added to its sum of digits gives 221425530.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3690396 + ... + 3690455.

It is an arithmetic number, because the mean of its divisors is an integer number (33213834).

Almost surely, 2^221425530 is an apocalyptic number.

221425530 is an abundant number, since it is smaller than the sum of its proper divisors (309995814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221425530 is a wasteful number, since it uses less digits than its factorization.

221425530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7380861.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 221425530 is about 14880.3739872357. The cubic root of 221425530 is about 604.9821546088.

Adding to 221425530 its reverse (35524122), we get a palindrome (256949652).

It can be divided in two parts, 22142 and 5530, that added together give a palindrome (27672).

The spelling of 221425530 in words is "two hundred twenty-one million, four hundred twenty-five thousand, five hundred thirty".